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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '580575933be283dc7b8c752a8c52787f322986d735fc491478415760f7a7b5e1' 
  AND token = 'gB91hgX97RXx3+m4dCtzpSLdAs0TWpuzqxu9S6Kj68w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}