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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c39c00a6fe3e955cf70e0513a641799a8f18b3f41513512090c3eaad7e6edf' 
  AND token = '3vUeyaoRD0cJV3chhPjtNU4++swVwRC35DlnTaojadE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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