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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c323297707cae99fd3f1d703990fec852b4764ef6d281bc4ed10901116e2d2d7' 
  AND token = 'hCzZiZc5620k3U9GYYFTDgci8ZIPix5+OzjZxmZfOi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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