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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603aace2c02d1306e5bc52d183af9050aa13ef3c5016a95d3afa57b0d0a26cde' 
  AND token = 'WWZ+G5Swa30TNvk/+6CMoSZrp5W6QB+K/9qoPlMYrQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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