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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dd9c2e9444762e8e0f3515c010218478ba5f782e383be3a4e5f7b05024a973' 
  AND token = 'VcAZWmpiRf8MD6lIdoE/iaqz83lWcPqnzSct0Uyf76c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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