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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4c88b6705c4e67c10025b0e065eea7a8798d3a375f27327f6b19ca0c13e47b' 
  AND token = 'dErgZ3OOF9YnMRAlPxf5fsXjrC2NqJOD+XYHdxCLd8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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