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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669d741a53052ba724fbc8891a88fbf824452e01eb2cbffa31420565b05d826e' 
  AND token = '4vFA4xIGzZSyJ72S1VUHmB8eYFWdJRl0gqY2r7GmUb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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