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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97ca64fd978718cf92a82dd55a5925549fcfe9ecbd11e8452a3b5e59af9b8c1' 
  AND token = 'oYdOP/sC4bWptyYDPecJCY+KH5DWoRAoIAyaVcK2i0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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