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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41688426ad3f1f51ff1f20cc37daade9a22a36c06cf16e107303aebb77082e82' 
  AND token = '2wk21IvXRGSNllrdO3Zy00hECwBfH3TNrksRZQKnV2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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