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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999384d21d86a9d2be36454a413a2a0c9dc29172094ecc7c34a5a3b8a3140a57' 
  AND token = 'Qz0j5EOG8BXJT1xScg31hZEGx/7x3pHV50vx2hdb1MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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