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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4179213a3533d22a1f6048ecf2959ae68703ec1ea07f80b120a5b8fb530eb3d3' 
  AND token = 'Py2unu0nsVxrdb7sIvWzi25xaXMxYb3hVNc0gWxSiCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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