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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd910898e862194f7d2228c5ff4cd10542fc45a48897cfaf0c9fac4d2e8b30f8' 
  AND token = 'acT8sO3f+X2/1YQ8tdH4LpxN4RVHAjGRo8FfIBlbnno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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