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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949d3a0b6cb7cc311ffa61c28271092e7d94aaeadb83a31e8003d51a66dd08aa' 
  AND token = '/JIUpY5M89dV+GoK9FLjyDXyEDZ1Vd1XRxVwC/vwdck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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