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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f78e75e7bc14416625e7485b6d9cb0a1a899011e3b5c57eae74ec66b855289' 
  AND token = 'RK0qgWA5nmXZiOBrceY9AB7RcjaneFW45+kWZGy3NdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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