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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20f53d889fc159ace5910d0d511f9e62c55ff6828d9a35abfedf76494a4ef65' 
  AND token = 'gQY0FsK4g2xeYv3JDwchnBq2eeJEmosyGhoVkUkuUdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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