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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015edb345500bc7773e870863f01cadc1a9c470df47f5ec262c2cf560c48de63' 
  AND token = '73DKqm8LJEXNBDzOR5O6B98ZPljLWWLUCpKkSaCApFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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