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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f317691f5a00d5d79dc68bba928a82279ba1a09e2c7f7048668bd6a904a55fb6' 
  AND token = 'NW1rvoViaSoCXpCgZ/Z3Kni2Ng21mGVpe1EG0ObYklc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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