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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655ca6dc977e3a0f81f9193f06421a559a24aafb49a43eb41dc968e501be0091' 
  AND token = 'jTL35YJOhvWPBG4dAEyHLP5jFxxtKP715EGLM4wU0Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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