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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d56dfa30049b5ac11cd17ad8bb8ee4fc1e3552d2b384a073e74490146a4d1e' 
  AND token = 'BK6iDTm2T9uMJOdzGlcyCiD5H60zorreEZMdHYEdmVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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