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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63958c99251650244d9923a329497b12066690c22133242fda6d6c7fe9c0974' 
  AND token = 'G56ALAmXmBE4VnzeLX/dJRoqtG4DcdSdZ2bTHez4Qrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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