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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ed18b9d3dee79e5b817c7e20a1246a995920e619ea0f68ed74f9e6743bd05f' 
  AND token = 'WGBfGCMvxT/8cPWTLKgj7MZ+9memUu0jhl3aZNSC8Es=' 
  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"
    }
  }
}