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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5171e099e7c04c849d05812a3c358a52468f6b9d255eab77a084950eee250eb9' 
  AND token = 'rXNwck/0t4PA4eVtVA5uUB2mu8Tkh2lG/wW6X9nZqnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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