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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fc14b5bb7cd246b98e0f9bb7b52b904b36a51c2985c07ef39cb6012052a8dd' 
  AND token = 'iw3DV6OTu3zAkxBd7yDdTk2jLnOHeioV3YuCKIp0MUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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