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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f9702e83d209205c6bdd3298e6677886724a65f3a1a1c0db1f2b2ec7935d6f' 
  AND token = 'Azmfr6ePypXjMpwm/1IVNF8pnHS7u3dI9en9SWvGoik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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