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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a97d50226dde01dc41a4d4b12b7c484f48c4e4a7a96ec33dd854f09425f1db' 
  AND token = 'zLYP0V5YkaueZDMjkfjcou2ErB5jgXOWj3lMltzewSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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