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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cd8b5cc5bf38e8774a1873f215fe7952ac7d03d9a883f7dda60ffed4bccf2d' 
  AND token = 'jaPhQ61iTKKVHKiM6muPbbEr9hThTXzD7pr+Puc8Nv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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