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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8f85b359a06eebd8a6680ce39fad5aaa5d1969fdcb9b9e990525384ad29cbc' 
  AND token = 'f7BSzfK03JffSagau2aRX23khGVYXAZw27lSoP3BvqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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