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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1511032a51cd0fe193b09f292982129e1b99eec3755619f15b3182172d2637' 
  AND token = 'gJ6Hq3WyIpaK9SWBUnjNoF6B6tEa5LZ14/zK0vki+qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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