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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50f5bd2500757bc713883e6e4d631c7a4fbe92afd6aa4276cc182797b41502b' 
  AND token = 'nBfxdVVRfNLv1VQ9gMRnFIdbiPCdbvlYiapMjXcwGbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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