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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85957cb5f88a86366e28e045f9e959bf017c200b3812786db23379531d41c83a' 
  AND token = '9NFZJHTTYUnpF8eR719k/4CyTKrbP7udMdqwIC/3a40=' 
  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"
    }
  }
}