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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37d52cf0e43bd4ec2f5165d6bda66d3b48a7ef8fb4b86af1c2fc58cbfaccf845' 
  AND token = 'tGG3nfb8zWzwPqdRPzs5pSIRcOoO8Y5t0vaOnz0veBc=' 
  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"
    }
  }
}