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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6236bb6dd928893d6c58f771e825dde22e7aef68bb3f494077a4b1882b030be' 
  AND token = '8b6UpbQiW4fTraR+X5jtvR4H2P5k2YRy0BwGU16Y374=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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