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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b763631906bc68912af943e4d136347e5d3b321bb3338d9f619563c8cb471b0' 
  AND token = 'w1B31wBX1v0wKeMrKALKAp6IXaaMAOfVT1lZ/o9qa5U=' 
  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"
    }
  }
}