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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24abcdd651ed9f73bf02ec077d5542ca4b033851f4f0b7bc3f7fc20258e5c59f' 
  AND token = '8YbNWxi6XyK/iB3itkpknspnntVo13j148Hpg4y0ql0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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