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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406d0523aef239e9255be64260461eecbff85778a8c2482f4307dc389c3d2e95' 
  AND token = 'Q2Ks0lZfhGOix9yh7TjxwS6W69Utyta1A28rx9/SwPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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