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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3efa281d4657808458cc692a7d9de4a1e50f4b805402321b74a61ea1c7f07d' 
  AND token = 'T7T0FisyO5+SXGLixMOaI5yd4H4sY2hosqi7N3sq/YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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