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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94ec59d3360fe545f086b5a4c37e7f275141c504394aeace9b66371cedec803' 
  AND token = 'vc+QdslDhNSBJMaBcj/yUf2r214Yt9xLGytOrnCKTDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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