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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1df77d2393a794ceae3bc69cf4108bab75356e22a99b8924a309d0f6496a431' 
  AND token = 'AWn/11cX86i4U+4EsUHEsbLpoO7Oi/AOqrrKrLZYcTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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