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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d1a2cdba12350ee6dfbca3b36df13cdc60c174dbadc9855f3a711835031abbb' 
  AND token = 'C+/OMqYKC0r2ej1YzcLB0ZDewOmNZhQt6LIfbZLr6Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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