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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ff1fe5d1f01ab985da3ecc34fd94f3757ed1ed3d401f9c1783621d4188b99a' 
  AND token = 'QjGd7FI8ed/AehCHuU9H2/tOjediaYkoIwxigG8MkqE=' 
  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"
    }
  }
}