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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b22b259649ee7a0e68e0113f2f70e3c79c21c93f9e035722e5fc6f8f3d86459' 
  AND token = 'z7tjSN5fljDweODxPFulqCHjqAZrqSDwWvtrKQNmrpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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