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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea6791af75cf44198e76d811f3a5f25e4b263722dbc0571c5498fbaf7a1944e5' 
  AND token = 'l6MtJcc+DK4KdavGDHAagO/w1DDbEKGV2x8lpr8i/8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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