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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416cf5b97a84e4092e68c6e1fcd77d4f5447227af56a083881b7f204a7436ea1' 
  AND token = 'rGKlvq0D53w3jeQqiQjT1lklo2DWctI2YwO27T3P2ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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