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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955b13c79e18cc4451d362e325c751152b04221ea51f61c0bca415cd380a3240' 
  AND token = 'Ns7lG18ABC6RtgNBGA1Jq4+h707nphu+IBYrUCW7gfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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