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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e699bdc34374ba5ce935b5ac58a65b274484261c0739d200648dc5aadfce29' 
  AND token = '5tacjDD/4IhE+uEMLZ1ru3totBzbEu//vF/0oLDOCYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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