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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd8cfd9e2d9e6f34a02d2eb76bb8e770f82166c90b938600b7e3beed7b7eb4b' 
  AND token = 'IbvU2RnR36Cp9tikcOeuo9YOSvjK/r/0wDU0PWvakzk=' 
  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"
    }
  }
}