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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa130ba0444abab4b30d7b6151ecce9feb24efa5b378acdc7b9a339ef316bd1' 
  AND token = 'kBif+9Jk07H5YkGkTGle53Mb7nw5VR0VG02UVeT3Xpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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