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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7910b6b3161e7cbc907d0bc7f5cf2ccdf03cd14c6342fd203de60748a2fd11bd' 
  AND token = 'tYeNeRvWIBUYZ0olwLpSLURGJ533tLY2BXhBtHI/Akg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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