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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8054ec70081f5df20e7856c1e51fd361b7c7339e42a0328bbe5ac2d01b04958d' 
  AND token = 'lySCB240HSxZWowqMsJbOYB8B7Xe1DGI9KXCwG8Buyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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