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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d4e7946d8fc116902b13391cac43394681d49c9c9a0bcc0bb61c8ac60e4e05' 
  AND token = '9tSRnPCKTGq5dJmYCLXuVwxzCurKNEhHyxzjM23xlL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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