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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ed3a3a6c2bc40be509f372b1dfce4a779a8fd538c40fb99d85136846d3b039' 
  AND token = 'VZyogelbXLUzIow1txc8LL2FqQEuUoe+c8x8YpSh5v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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