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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5224dcc008b624ff19ff13a9113b4f3d8d8abb9ef21e52f2113ccecdd74728d' 
  AND token = '4yzpUH+3P5Vc45vBLR0y18DbK4nM+iguwUDNyOr66LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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