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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a652447377b92f46e09b6aeef055ace82bffed7ead7ce6ab71ed20c6a86b8001' 
  AND token = 'qNa3AY9dq0lGDyoGOG0D7Lodisu83UUV8rGdxnc+qzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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