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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9145f634cc818448b91becb6d26d706cbc32eead711e37aa99c09b8a26ec6a43' 
  AND token = '62j8L1jN4P+s+oOPKSPuwNMK9nvj6QLnXvnbboK7CJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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