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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeac7d09287fa0b3b09aa5a7493c7750d5bb6e76db3d56f06552ec077c7b5ce3' 
  AND token = 'nobHZM89t/lGNnx7tXm6+lnJms3VM3M19dh3BVoKd8c=' 
  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"
    }
  }
}