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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a2df24754d857a6065138fad9c07be3fec100db19dbb0856077fc965612c2e' 
  AND token = 'dm+aA7U6nJpxvD0Zu6heFGQ8fRuqwKr1ey6ioGEqThY=' 
  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"
    }
  }
}