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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70516ca2e138f4639860319346437a61e2e2b18dccf3174174c80ea9122f6d85' 
  AND token = 'u5bipHCHCQCeGVmTCLuHdv+Q6cG6M7dMFTd/3Lzo+MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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