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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b166d1f50ca04a0abd52637093d48cb4ba9136e10cb97cba5e512ebbce5dd040' 
  AND token = 'ZMyycPBtNzL0gJdFFHENha9Ghvfuq4UQlcup3qOjnrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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