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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adbc22a13ae7cf0b7ac70086c6ce2cd9c6e2d8fe1796fa83a430cb1419231f3' 
  AND token = '1aP7g6v0WdMU3l2Wj2cRlgBosP1FoJ6FwjzdsNerp8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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