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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d16c2bab6f06cc4713234ab4e14100a0a3e71fd8f4b372174efbbcfd5588973' 
  AND token = 'aZaAdPGjOZsKx01QhCgUD7svlcB2ZkGOQQP126K4ZeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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