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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc13d29a5a263a7b2f1e37c42c49ed8f644a0d2b4bd68c1212da9cef3b065f94' 
  AND token = '/ZrHhlS1J3dE1+Kp1bIU6nEC83wp+nmTiyTBAgYRYC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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