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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd97593b1230f3a7798f41376dff02a75e203f830cc5f39af99d92a7cac17e93' 
  AND token = 'FlFQVCYzPrAAx4fuJoprQcKiWAdC0FMFzxgS48wV3h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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