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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27771587a663796ed64a6ac2d993f1b32f204562dbe0c29c20351e20e3859421' 
  AND token = 'lD6eG3TkUvTUWTLkrOaEYGABud05ubNX6+WcabuaHJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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