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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f8e6f4e6a8ae08faa27699c9de9ff4eb91b14b15476c2fd72a19a4047fdafa' 
  AND token = '1UlLCIr3p8Fob27IU9BiZeqQnioFuz2RW4Z6HH1lGpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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